Spatial partitioning of relative fishing mortality and spawning stock biomass of Icelandic cod
Spatial partitioning of relative fishing mortality and spawning stock biomass of Icelandic cod
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DOI：
10.1016/s0165-7836(02)00025-5
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发表时间：
2003-01-03
影响因子：
2.4
通讯作者：
Marteinsdottir, G
中科院分区：
文献类型：
--
作者：
Begg, GA;Marteinsdottir, G
捕捞死亡率影响种群的人口特征，是鱼类种群产卵鱼损失的主要决定因素;直接影响种群生产力和补充变异性。我们调查了捕鱼的鳕鱼（鳕morhua）在冰岛沃茨的产卵群的组成的影响，通过分区相对捕捞死亡率和产卵群生物量（SSB）到更精细的空间组成比以前使用的。与冰岛沃茨鳕鱼种群结构的传统模式相反，在全国各地确定了具有生殖重要性的地理区域。SSB和相对捕捞死亡率分布不均，在沃茨周围的冰岛，刺网选择性地删除较大的产卵器从近岸沃茨的主要产卵场，其人口特征更有利于后代的生存。空间上明确的开发模式的变化所引起的种群结构和人口特征的变化，可通过不同程度的繁殖潜力损失，对种群生产力产生重大影响。我们的方法分割SSB到更精细的空间单位比以前使用的，能够更详细的分析产卵和开发冰岛鳕鱼种群的分布，并将使发展的空间分解模型的总鸡蛋产量，这反过来又可能有助于区分内在的变异性股票招聘关系。(C)2002 Elsevier Science B. V.保留所有权利。
Fishing mortality affects demographic characteristics of a population, and is a major determinant in loss of spawners from a fish stock; directly influencing stock productivity and recruitment variability. We investigated the effects of fishing on the composition of the spawning stock of cod (Gadus morhua) in Icelandic waters by partitioning relative fishing mortality and spawning stock biomass (SSB) into finer spatial components than those used previously. Geographic regions of reproductive importance were identified around the country, in contrast to traditional paradigms of cod stock structure in Icelandic waters. SSB and relative fishing mortality were unevenly distributed in waters around Iceland, where gill nets selectively removed larger spawners from inshore waters of the main spawning grounds, whose demographic characteristics were more conducive to progeny survival. Changes in stock structure and demographic characteristics caused by changes in spatially explicit exploitation patterns can significantly affect stock productivity through differential loss of reproductive potential. Our approach of partitioning SSB into finer spatial units than those used previously, enabled a more detailed analysis of the distribution of spawners and exploitation of the Icelandic cod stock, and will enable the development of spatially disaggregated models of total egg production, that in turn may assist in differentiating the inherent variability within stock-recruitment relationships. (C) 2002 Elsevier Science B.V. All rights reserved.